Rotogravure printing-press.



J. C. YETTER. ROTOGRAVURE PRINHNG PRESS. APPLICATION men nwzo, x915.

Patented Oct. 1?, 1916. 2 snzns-smzsr 1.

4; c. YETTER. ROT O GRAVURE PRINUNG PRESS. APPLICATION FILED DECJO. "H5.

' Patented 0015111916 2 SHEETS-SHEET 2'.

JOHN C. YETTER. OF CHICAGO, ILLINOIS.

RQTOGRAVURE PRINTING-PRESS.

following to be a full, clear, and exact description of the invention,such as will cn able others skilled in the art to which it.

appertains to make and use the same.

This invention relates to improvements in so-called rotogravure printingpresses, and has for its particular object to provide means for rapidlyand effectively drying the printed sheets immediately after printing thesame, and before they are delivered to the sheet delivery mechanism ofthe press. In presses of this character the ink is applied relativelythickly from a copper printing roll and, though a very quick-drying inkis employed, it very frequently happens that the sheets are smudged bysurface contact with each other whendelivered on the stack by the sheetdelivery mechanism.

To avoid such smudging is the particular object of the presentinvention.

In the accompanying drawings illustrating a suitable embodiment of myinvention: Figure 1- is a. fragmentary view in side elevation of arotrogravure printing press embodying my invention. Fig. -2- is afragmentary detail vertical longitudinal section of the same on anenlarged scale. Fig. 3 is a. vertical transverse section of the same onthe line 33 of Fig. 1-. Fig. 4- is afragmcntary detail View in elevationshowing the jacket for what I term the drying roll of the machine.

The press comprises a supporting frame 1 equipped with a feed table 2and an impression roller 3 rotatably supported in bearings 4 on theframe 1. The said roller 3 is provided with the usual sheet-engagingmechanism 5, which is not particularly illustrated herein as itconstitutes no part of the present invention. Associated with the roller3 is the printing roll 6 to which ink is applied by a roller 7 in theusual and well-known manner. Said rolls 3 and 6 rotate in oppositedirections thereby printing the exposed or convex face of the sheetcarried by the roll 3, the said sheet being delivered from the roll 3 tothe roll sin a well-known manner. The roll 8 is equipped T withsheet-engaging mechanism 9 which is Specification of Letters Patent.

Patented Oct. 17, 1916.

Application fil ed December 20, 1915. Serial No. 67,886.

of the usual and ordinary construction, and is, therefore, notspecifically illustrated herein. The said roll 8 is hollow and itscircumferential wall is perforated. It communicates atone end, throughthe hollow trunnion 10 thereof, with a source of supply of hotcompressed air by means of the pipe 11 connected with the bearing forsaid hollow trunnion 10. Disposed concentric with the said roll 8 andrigidly mounted on the frame 1 in any suitable manner, is a jacket 12 ofsheet metal, the interior surface of which is preferably very smooth.Said jacket is provided with slots 13 and 1 1 livered, respectively. Theroll 15, equipped with sheet-engaging mechanism 16, of usual andordinary construction, receives the sheets from the roll 8, and deliversthe same upon the sheet delivery belts 17 in a wel1- known manner. Thesaid roll 8 is provided contiguous to its ends with a pair of slidablecollars 18, which are adjustable toward and from the middle of said roll8, and are suitably held in place in any well-known manner. The sideedges of the sheets delivered from the roll 3 are adapted to rest on theannular faces said collars. The sheet engaging mechanism 9 is disposedto engage the end of the sheet in the cylindrical plane of the exterioror convex faces of said collars 18. Thus the perforatedf c'ter. than thesheet-supporting surface, the sheet being maintained bellied outwardlyby the force of the air currents delivered from the perforations of saidcylinder and impinging against the printed face of the sheet whichopposes said perforations. The said jacket 12 is provided with aconcaveconvex projection 19 which is connected at one end with anexhaust pipe 20 which in turn communicates with an exhaust fan orsimilar well-known device not herein illustrated, whereby the airdelivered into'the jacket from the pipe 11 and perforations of' thecylinder employed contains a large percentage of benzin or similarvolatile liquid, it is advantageous to draw off the air-admitted andcarrying the vapors in order to maintain the air in the press-room freeof the same. The said drier may obviously be incorporated in a press forconsecutively printing both sides of sheets in one passage through thepress, the number of driers emis drawn off. As the ink ployedcorresponding with the number of sets of printing elements of the press.

It will be understood, of course, that I have limited the illustrationto the details of construction only of those elements which enter intothe combination forming subject of the invention, the latter consistingin the features of construction and combinations of parts defined in theappended claims and including any equivalent or substitution of any orall of said elements falling within the scope of such claims.

I claim as my invention:

1. In a printing press, the combination with the printing and impressionrolls, and sheet delivery mechanism, of a hollow perforated rollinterposed between the same equipped with sheet -engaging n'ieans, thesheet adapted to have its printed face opposed to the surface of saidroll, connection between the interior of said roll and a source *efsupply of air under pressure for effecting -forced passage of air overthe printed face of the sheet during engagement thereof with said roll,a jacket concentric with said roll and rigid with the frame of themachine and between which and said roll the sheet is adapted to pass,there being slots in said jacket through which the sheet is received anddelivered.

2. In a printing press, the combination with the printing and impressionrolls, and sheet delivery mechanism, of a hollow 'ierforatcd rollinterposed between the same equipped with sheet--cngaging means, thesheet adapted to have its printed face opposed to the surface of saidroll, connection between the interior of said roll and a source ofsupply of air under pressure for effecting fbrced passage of air overthe printed face of the sheet during engagement thereof with said roll,a jacket concentric with said roll and rigidwitlr the frame of themachine and between which and said roll the sheetis adapted to pass,there being slots in said jacket through which the sheet is received anddelivered, and connection between said jacketand a suction pipe;

In a printing press, the combination with the printing and impressionrolls, and sheet delivery mechanism, of a hollow perforated rollinterposed between the same equipped with sheet-engaging means, thesheet adapted to have its printed face opposed to the surface of saidroll, connection between the interior of said roll and a source ofsupply of air under pressure for effecting forced passage of air overthe printed face of the sheet during engagen'ient thereof with saidroll. a jacket concentric with said roll and rigid with the frame of themachine and between which and said roll the sheet is adapted to pass,there being slots in said jacket through which the sheet is received anddelivered, and means adapted for exhausting the air from said jacket atthat portion that the sheet does not pass.

4. In a printing press, the combination with the printing and impressionrolls, and sheet delivery mechanism, of a hollow. perforated rollinterposed between the same equipped with sheet-engaging means, thesheet adapted to have its printed face opposed to the surface of saidroll, connection between the interior of said roll and a source ofsupply of air under pressure for effecting forced passage of air overthe printed face of the sheet during engagement thereof with said roll.a jacket concentric with said roll and rigid with the frame of themachine and between which and said roll the sheet is adapted to pass,there being slots in said jacket through which the sheet is received anddelivered, whereby the sheet travels more than one hundred and eightydegrees around said perforated roll, and a suction pipe connected withthe casing adjacent to the delivery slot and on the portion between thetwo slots where the sheet does not travel.

In testimony whereof I have signed my name in presence of twosubscribing witnesses.

J OlIN C. YETTIQR. Witnesses:

M. M. BOYLE, G. M. WALKER, Jr.

